Method of manufacturing adsorbents

Abstract

A carbonaceous adsorbent impreganted with elementary sulfur is produced by mixing the adsorbent with elementary sulfur in a quantity required for the desired impregnation, heating the mixture to a temperature between 120° and 300° C., maintaining this temperature over a time period of between 1 and 40 hours, and then cooling the mixture.

We claim: 
     
       1. A method of manufacturing a carbonaceous adsorbent impregnated with elementary sulfur, comprising the steps of: mixing a carbonaceous adsorbent with elementary sulfur;   heating the thus obtained mixture to a temperature of 120°-300° C.;   maintaining this temperature for a time period of 1-40 hours; and   cooling the mixture, so that the elementary sulfur impregnated carbonaceous adsorbent produced is uniformaly distributed with a fixed quantity of elementary sulfur adsorbed exclusively into the inner surface of the carbonaceous adsorbent instead of distributed over the outer surface of the carbonaceous adsorbent.   
     
     
       2. A method as defined in claim 1, wherein said heating step includes heating of the mixture of the carbonaceous adsorbent with elementary sulfur in stationary pile. 
     
     
       3. A method as defined in claim 1, wherein said step of heating the mixture of carbonaceous adsorbent with elementary sulfur includes heating the mixture in a movable pile. 
     
     
       4. A method as defined in claim 1, wherein said mixing step includes mixing the adsorbent with elementary sulfur in a mixing ratio of between 1:0.02 and 1:0.55. 
     
     
       5. A method as defined in claim 1, wherein said mixing step includes using the adsorbent which has a BET surface of between 40 and 1,300 m 2  /g and a macropore volume of between 20 and 80 cm 3  /100 g. 
     
     
       6. A method as defined in claim 1, wherein said heating and maintaining step includes thermally treating the mixture under pressure.